1989879 has 8 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 1313976.

The previous prime is 1989877. The next prime is 1989899. The reversal of 1989879 is 9789891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1989879 - 2¹ = 1989877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2779 + ... + 3420.

It is an arithmetic number, because the mean of its divisors is an integer number (334800).

2^1989879 is an apocalyptic number.

1989879 is a deficient number, since it is larger than the sum of its proper divisors (688521).

1989879 is a wasteful number, since it uses less digits than its factorization.

1989879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6309.

The product of its digits is 326592, while the sum is 51.

The square root of 1989879 is about 1410.6307100017. The cubic root of 1989879 is about 125.7792177970.

It can be divided in two parts, 19 and 89879, that added together give a palindrome (89898).

The spelling of 1989879 in words is "one million, nine hundred eighty-nine thousand, eight hundred seventy-nine".